 <!DOCTYPE html>
  <html>
  <head>
    <meta charset="utf-8">
    <title>hello-backbonejs</title>
  </head>
  <body>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.0.3/jquery.js"></script>
  <script src="http://ajax.cdnjs.com/ajax/libs/json2/20110223/json2.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.5.2/underscore.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.0/backbone-min.js"></script>

    <script src="5.js" type="text/javascript">
    
    
    </script>
  </body>
  </html>